add:Release Notes navigation to Help Center footer (#8571)

Co-authored-by: lakshya-dhariwal <lakshya@staq.com>

openlibrary/templates/lib/nav_foot.html

@@ -43,6 +43,7 @@ <h2>$:_('Help')</h2>
           <li><a href="/contact?$urlencode(dict(path=request.fullpath))" title="$_('Problems')">$_('Report A Problem')</a></li>
           <li><a href="/help/faq/editing" title="$_('Suggest Edits')">$_('Suggesting Edits')</a></li>
           <li><a href="/books/add" title="$_('Add a new book to Open Library')">$_('Add a Book')</a></li>
+          <li><a href="https://github.com/internetarchive/openlibrary/releases" title="$_('Release Notes')">$_('Release Notes')</a></li>
         </ul>
         <aside id="footer-icons">
           <a class="footer-icons__twitter" href="https://twitter.com/OpenLibrary">twitter</a>